KARO* is a platform for communication, architecture and spatial tactics founded in 2000 by Stefan Rettich, Antje Heuer and Bert Hafermalz. Stefan Rettich was visiting professor at the university of Kassel and is teaching since 2007 at the Bauhaus Kolleg in Dessau. KARO* has been invited to various international exhibitions, among others to the XI. and the XII. architecture biennale in Venice and has been awarded with the 2010 European Prize for Urban Public Space.